National Semiconductor LM2703 Micropower Step-up DC-DC Converter with 350mA Peak Current Limit
Summary
This micropower step-up DC/DC converter provides highly efficient power conversion in a compact SOT-23 package. Engineered for applications requiring minimal current draw, it features an adjustable output voltage up to 20V and ultra-low shutdown current. The manual serves as a comprehensive guide, detailing electrical specifications, typical application circuits (including LED backlighting and LCD bias), and necessary connection diagrams. It is the ideal component for designers of portable, battery-powered devices such as digital cameras, handheld electronics, and systems relying on Li-Ion power sources.
Manual Details
| Brand | National |
|---|---|
| Pages | 10 |
| File Size | 291.46 KB |
| Published | June 04, 2026 |
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Frequently Asked Questions
What is the typical input voltage range for the device?
The operating input voltage range (VIN) is 2.2V to 7.0V.
How do I use the LM2703 in a white LED backlight system?
It can drive up to 4 white LEDs, making it ideal for applications like cellular phone back-lighting.
What are the requirements for enabling/disabling the device using PN Pin 4 (SHDN)?
To enable the device, tie SHDN above 1.1V; to turn it off, tie it below 0.3V.
How is the output voltage adjusted?
The output voltage is set by selecting appropriate values for R1 and R2 at the feedback pins (FB).
What happens if I exceed the maximum allowable power dissipation?
Exceeding P(MAX) will cause excessive die temperature.